Final answer:
The program initializes a tuple with three elements and prints the length of the tuple, which is 3.
Step-by-step explanation:
The given program x = (10, 25, 5.0) initializes a tuple x with three elements: 10, 25, and 5.0. By using the len() function on x, it will return the length of the tuple, which is 3. Therefore, the output of len(x) is 3.